When set the forwarding mode of the pkt, it needs to update
the fwd_eng that it is the member of cur_fwd_config. Otherwise,
an error will occur when executing the set command and show
confg fwd.
the flows as follows:
   1. ./tespmd -w xxx -l xx -n 4 -- i
   2. set fwd mac
      testpmd> set fwd mac
      Set mac packet forwarding mode

   3. show config fwd
      testpmd> show config fwd
      io packet forwarding - ports=1 - cores=1 - streams=8 -...
      Logical Core 1 (socket 0) forwards packets on 8 streams:

When run the 1 ~ 3 step, it should show the packet forwarding is
mac.

Signed-off-by: Lijun Ou <redacted>
---
 app/test-pmd/config.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
index a7112c9..ee0e904 100644
--- a/app/test-pmd/config.c
+++ b/app/test-pmd/config.c

@@ -3158,6 +3158,7 @@ set_pkt_forwarding_mode(const char *fwd_mode_name)
 			       fwd_mode_name,
 			       retry_enabled == 0 ? "" : " with retry");
 			cur_fwd_eng = fwd_eng;
+			cur_fwd_config.fwd_eng = fwd_eng;
 			return;
 		}
 		i++;

-- 
2.7.4